needless to say, what temp it starts to open at would depend on the temp
rating of the t-stat.

if Don has a 'par' value stat ..say 180F ..
I would expect start of opening to be a bit above 170 F or so.

and why not use water ? that's what the books show I believe.
Scott

On 9/15/2015 9:23 AM, David Beierl wrote:
> At 02:58 PM 9/12/2015, Don Hanson wrote:
>>    Is there an accepted method to test the function of one of our double
>> style thermostats?   I am skeptical about the proper operation of my
>> currently installed one.... lately....I have had some other issues with
>
> Put it in a pan of vegetable oil or 100% gycol antifreeze (caution:
> both are flammable) and heat it on a stove.  Opening begins
> ~85C/185F.  Opening complete ~105C/221F.  Minimum opening stroke 8
> mm/.35 in.
>
> Yrs,
> d
>